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In this tutorial by Tech Support Aid, Kumar demonstrates how to encrypt a PDF file using Adobe Acrobat Pro. To begin, you must have Adobe Acrobat Pro installed on your system. Open the PDF file in Adobe Acrobat Pro, go to file, then select properties and password security. Set a password for the document to require it each time it is opened, and apply restrictions for printing, copying, and changes. Make sure to remember the password to access the file.